Vegetable Diseases in Greenhouses Enter the Phase of Prosperity

March 11, 2020

The recent rapid increase in temperature has resulted in a significant increase in the growth of fruits and vegetables in greenhouses, and various diseases have begun to enter their peak period. Localities should pay close attention to the occurrence of diseases and actively carry out preventive work.
It has been observed that cucumber powdery mildew in greenhouses this year has only seen on May 4th, and it is expected that the onset period will be in mid-late May; the growing period of exposed vegetables will be later, and the powdery mildew period will be delayed until early June. If the continuous high-temperature dry weather occurs in mid-late and late May, powdery mildew will occur moderately. Greenhouse Cucumber Bacterial keratoses first seen on May 1, followed by rapid development of the disease in the next few days, a small number of sheds bacterial keratoses and downy mildew mixed, which in order to Miqin and Tianjin excellent series of cucumber and early sowing Field weight is heavy. At present, bacterial angular spot disease has entered the initial stage of onset and has a moderate overall degree of occurrence.
To prevent powdery mildew, timely removal of the diseased leaves in the field should be combined with field management, and the use of Shigao (10% difenoconazole water dispersible granules) or Xiansheng (62.25% mancozebium and myclobutanil wettable powder) at the early stage of disease. ) 1000 times the spray on the plant in the lower part of the control, every 5-7 days to prevent and control again. For downy mildew and bacterial keratoses, fertilizer and water management should be strengthened to avoid flooding and splashing, and old leaves should be promptly removed. When the diseased plant rate exceeds 5%, it can be killed (77% copper hydroxide wettable powder). ) 1000 times liquid plus 72% of agricultural streptomycin soluble powder 3000 times spray control.
In addition, there are currently some greenhouse shed eggplant and tomato fields in southern Brazil, the damage is relatively heavy, can be used 20% ciprofloxacin soluble powder 1000 times the middle of the lower leaf spray, every 5-6 days to prevent and control once.

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